In Oracle Integration Generation 3, you can extend (customize) an integration in an accelerator project by adding and configuring an extension group. An extension group enables you to extend your integration by adding invoke connections; stitch, for-each, switch, map, and integration actions; and global variables to the integrations in your accelerator project.

For more details on how to perform these changes, refer to the Manage a Project section of Using Integrations in Oracle Integration 3 at https://docs.oracle.com/en/cloud/paas/application-integration/integrations-user/manage-project.html#GUID-A840E945-3F4E-4917-8DAF-5234840CF8F4. You can also refer to Doc ID 3017378.1 (How To Extend Oracle Integration Cloud Gen3 Project) in My Oracle Support.